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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c757e97b34d7c60fe9012e1ee5d84f8b9ec8c88c869bb68b711f82cb05b6b4' 
  AND token = 'PhVpkLLknOYDDEpPGAJSsLlxX3WkNk3CVkOXDK1WZrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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