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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddffae02e2a3c88461f784d0922bb88ec84da5444dc62f193d1f55bf0cea985e' 
  AND token = 'Hyb83Oqb9m1CJWWgboXuV3FOwuEbQHSFdvp4Jm/ngvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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