SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0443f82138257b988368356a1eac8b61d8212715e390dcf2fc408baa3508c9' 
  AND token = '5lpiIcoVSKuBgSYNgJq56RH4v4Eu3bAVbsPkaA/DCLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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