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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd596df9da0fc4c4ba702a9db326d610a17a5bee6664036bf2e895f48d9298726' 
  AND token = 'wPhB0eP4pJAg0kGtQfMpEB47peGyG8zy+4nyuWkpgPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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