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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498e2d70be63ce580c4de737a4265c018ef62e194aae54156ff001db97da9ab2' 
  AND token = 'J1RU2oITenAwgp72Ua3qOJ9plZTw0r6B7bpAZcfRuEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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