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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eceb4a5158c8112b893d48a7e1df42046e0fa6ae8d20b7fc8b1af5d79e94b3c6' 
  AND token = 'RCrHz5y8XLtxMid9MK5u23NYRgZfjoDs/kT/A1N5K+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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