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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698713d4070bf8e650401b245f1b92f338a4c85d64f467a3fa8d2cdf16496887' 
  AND token = 'IplngrkvOkc3YvoF1oE5Kp3DwnPQRkwmtcof71WtksY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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