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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6ddb95741b3a5f24e293cc9ecd54695b9dd1575b98841a5e93cd99e2599ddc' 
  AND token = 'r9+Z5Fsr5fTeEgiYOCuhurQ8pgs0q/vCxrujGjriFtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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