SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a032ac11e47812a61795d0bca245cf3fa5e470c79732591c74c1fbde4d83102' 
  AND token = 'hXYZuEWVpa+gyPzuMWRN/UYL7oskBEqAjD1sK6Bkr9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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