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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ef76a33a67484e1b0d30ca79402c71ceed900451210b5e7b39808aff0bc471' 
  AND token = 'YrLvBaNYpfZxwTS20Cb7t4mO7o9r6wIxqxMhaNjY/pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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