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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3fc723a08bd319c78ff4a3967b1ecc51f5804b23f93ac8d1c35b1a6b132f3a' 
  AND token = '2Rerqk3FMV/fkaijZF9nxavMnrr4Id+M0a5frc/757k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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