Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458ce2d422e25634a14e1f26761a3c732a5b137e65a3341dabeaf23e3637eb55' 
  AND token = '782gtEKusPJiuqPhdnByZGGsIrSERP2umeQrne1+Dk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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