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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ebe7c110f9d3165ee320d450732e321128530911b7dac3b2e94b5bdb3e507' 
  AND token = 'KCn47uJLAYQtetdjhfHqxlk/teMMKwd0G6yFarTjxOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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