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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2293615d5cb8ac151f4cd1321bb7448099c087569164b989763bd61b941bd7dc' 
  AND token = 'pLo1QZ4mha5QjCtMgxuoFe986V8hI+C/TFxtqsPgGe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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