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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca9b858a4ea74f1f02f573dc0900ba8f1cc7c3dacdf6c426696b9d063526efd' 
  AND token = '0Khqn0zyiCrG9A0wdAa4lAtB4YRr6sQF9pZJsk/bKXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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