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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bffa1fe2313ded66a2304580f6d67cf30b2a4cbe39c134f212b4534695a4ab' 
  AND token = 'RcsfcP3OvxXwFNGnmSkwpU5khXd22qWsRD842TCM7no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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