SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a190b2b484071ec284a5b36bb7d9367e43b96cf846ad170ad90c7ec213777929' 
  AND token = 'HY6S8xVLDpv1Zru3lLGTz2YrqEMBok90qoYwPGZNxmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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