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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9022056a94724c005cf36f439f6743502c406fb6a75e58de90ecf63ad5e0236' 
  AND token = 'DhuntFhoyWWMQNIzvzXEXhv78yfh7h2l+aJxX1ruA24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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