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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2685550f1ddeee8d236e0142bd87c2a989cd71cb5cfec4d8831b3bbe7a944cf' 
  AND token = 'L2L2713zLwqbeJ/in9gsmziiQCMFkLvk7YhU0btcm4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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