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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c7d36b1d561d797e40defd6df13eb16c9cbd9acab5b41beaab8617cbbf453b' 
  AND token = 'vN9m41yQ4J2YzIAxzZS3LLe0xacd/ayQatXSEu8OuJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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