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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe7bcc2fb6f7657df9faab5dd8451b06555685e286a52e2d823357ff46bded2' 
  AND token = 'RkzSrUemA0FXXIruZEQOUgY5b0mVAxA4HnpmeleSky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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