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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9947dc15741a19b43e6b9c2bb742a300bea06e6f6fedb1f36cfd2837aa20b7b9' 
  AND token = 'SVzSZsavdXmJWoPuriIYZm+gkjr5biT+6pahQdfoM04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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