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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e573ab0cfd8cd513c79e4c6083f18b371b46f7e112c200402c96a0651ff9f9c7' 
  AND token = 'QeYXfUusK5eEbo1Bk32x69zrtqzsEqU6P/7VKkTlPuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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