SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8154f9f73d3a7b99220847ed6e1f5101ec32d58a024135ab24402be701fc3b8a' 
  AND token = 'pCP+q7/noFwbGhPuc0YbvTJu6hZqIjLWJE+y0T++cLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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