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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeea625c3057b6844a2a197e97b4579f347b2678ab8a25572c6ce75c83e5f1a9' 
  AND token = 'Zu4ZmAgDEDRvntKMMamNmhkg+UGsjudUEWffT1yjTc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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