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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ac973faac0ef995110e401270d36b7bea3cb19be9ebc19bd362c9d9d0245f4' 
  AND token = 'cSKdW/JJlnvku8uJlC7AY4kOjsHrRCaxUkf6q5mlr3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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