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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087e4a230e6e26f9b7536f63ead50edb8fb528fabf4f93c7671050bd10775564' 
  AND token = 'CN42vzX3xK9IxeVIQ2m35S/Olgh/stbqN7GiLv0OcIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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