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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71480b800034a68864d3f06f373f2ef7ad6f750fc1ad2f7459fd1b5a8da85567' 
  AND token = '382eYwYuxxMzHOstcn7sqO22ydh6yvYGfo7+C9DGjIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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