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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b28501258532f12b5926e75b6e5257c1838b8c9e9924cc57b53dcf7801c0ddd' 
  AND token = 'tpYyECY3Tg5MOBn+0eHDNf1P+FeLjif12DCc0rpQcHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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