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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0049db9ed0acb3731fcc3e37d42f3c8637453923557bf49ec8f5a59dcb634bce' 
  AND token = '5pUpgNgDFi0qCzm2ln7dnzg7fTsR7iJm/NHN2QplVGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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