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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1691c231a878ca180da1d29a23258d47a9b6128876a869244b11a83655b2dcdb' 
  AND token = 'WaK9L1tFKwlalhe+uPQKYnRb3nv6NJX2wDr8PqoCpBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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