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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021a5cb485bdecb36ccf6233219ec2129404718074f20ce5d4ef00b7e1f93525' 
  AND token = 'zAk80wRxaXTUljCR6UdW++G6KrHBsqr+iRLar6wMl5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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