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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450aea954dfaa0c12a4fd30f8e62eec12ea8b7dbc973690679f6fbcb3d82771f' 
  AND token = 'sVdOEbDcO1EpwdCEzEPysCoc9PDIzWL+SivaaT94rV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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