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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cbcde5bba86b01258758436634a9c33a0be4349cb501ef57bdcf0ffc50f641' 
  AND token = 'D4JUGCRce18L4cV/eN4Z//qV/UmGPAxlkM6Ty7zpbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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