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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9305479e8436aed72b339324e980be0e68d40b500277540fa2734b2ff9df5686' 
  AND token = 'aLfXt310ehxXhvNFwuOJwkFm03UoYyshxboltGixt5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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