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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ae4da569bb5b3ce6219a1bf3bae0c37a07fca58ca22e7556cc527885d14dcb' 
  AND token = 'DwppIF0X6CC6P9acylz9r67G55OQAq0CEJkfk8xwxIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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