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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23a54f419f9559b8f12b50b7b49e7dad2cc1569a88676002230bdb429b8c6fc' 
  AND token = 'dUYgEgXaboCxnzo0/S+0oRr4tzElGkem//3CbHjNzQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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