Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2cf5cc893404345e5bc00ce6835fd148fdc51dec4794ea100c1706999c3e1c' 
  AND token = 'etH+dMbHKndXkq3ArFgYCfG0oUepPJUSb3VHNQmdm8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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