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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f207d47972e495bfa7658a48f908f70fa8e7d8ac748169a7783dc690a5a27bdd' 
  AND token = 'pKgdZChSlxBmJxUY8nQbLoSJMqF8YX9E5EtRwj9eb54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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