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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0184acbe9fa46042f263b9610e0d1de46d80c44b6fd371294ac795ebe1a671e3' 
  AND token = 'fcS+YGehx7xModogDlGsx6y/46A6EpOeQzK2ej2k82Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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