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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc1be5fa54f61dd54e9df1359374378b7c9f65ab9bd47ebf17da9a6ec520757' 
  AND token = 'dAOCPPNQQViCL5KrrWFn9jY/zsBWfB5dRlzmd9Iu2GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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