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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99a5e8f892e42184be4c174ff8bd95c4543b2a1c4f481c7599ec710739277df' 
  AND token = '0UsIxfAw0gxEDUKbcILh8ZqmimKf0/SjuRiK3Y6yC4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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