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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce750656828b7c97d73c08f402b62f0b9ed8adcbda0df59f8bc092c698a48719' 
  AND token = 'bS4GQYtD3E7d9mia/LXmPfPWl0CO5Ac4Z8umg6XmsSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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