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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaab282748ca69a5f11558f5215ec8734cd81da25921f1201f75526af566c3d' 
  AND token = 'j5UQReAdCMcKETTAvpO+9fRUja6Uuihb4LkxMzazlX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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