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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b5636c8b79b9b82dc7d455586b9c89bfb61c700b5e2a8568003735ad5894d0' 
  AND token = 'c6wv7jTemva34rDIi6XLkKgyGaBQUZ7RsrbSaUY9Of8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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