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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111fe6bf59144639dfc2c601bff166c175b104d42fb09545396ecb05d6185ae8' 
  AND token = 'c+R6Chm2IzBmmNX91z7JhGDDw787qfqzc0pq9qRzB+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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