SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5881d9abe094200ff438c26477f6d013353f89fc715733742775033f39ff5948' 
  AND token = 'ZlTwg9czw6ZytSwXoD/iizIvZAB/YXOVYPjRtUtWjBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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