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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359bbc98e85d61ed1b90a64494bce0c6c9546384f7a2b6d847ef49454e087bb0' 
  AND token = 'QctvfWb38MhPZEnTERUSfHRop8LkBkh86WN0ZMS0jHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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