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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544120f15737f1a8fbe00cd097af1aad4f01f023b777e455c9d933c22b3089c7' 
  AND token = 'n4iD38VQt8ihhwqo6eEwPmq9r1kiJ1YlvojxmaMR+uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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