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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f084c7b3e4310027139597d85831fa1595d496f4cbfbeed455684c9802cc606' 
  AND token = 'wn9krHLZFwcngi22Aycy0Yd4okMbYcQB9Xr3e5DMiD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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