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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ed1c0c18a8ff0855470d7c3cd3ebd4cbd5b283ddc6c8e21c183ef901b418f4' 
  AND token = 'hv3uIehMkLU8Ab/pTJu3XLXH8KlJVLd+sgV0KxRs3yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}