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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db98cfb6fea5db46871f98b0e10d916eef05e7aeec8e00a3bb2565f7c38814e8' 
  AND token = 'Q+oG9Kk0N6tN3UX5QvLWrwW7mF0myAcEj/v1bYwleXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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