Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9041452c513d92435776309633a36718ae6f2b0ddaa560b8a490957f5ed8db7' 
  AND token = 'r/YrV6s1QqL3EkaTH/YlCmTdj/lQAXS0SQ/vlY+EoMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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