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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39efbd514ddce5ce990de26cfc9bc96691ef178d851da80a60f9bce6cd8864e' 
  AND token = 'DktgacvqiRw62hBcexCzIuM9kI69dQpcacPczlaaMII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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