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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4838da0d91183b7de165ac4ab20909e7dfec779b5d7b178c8550fa069ddd7c13' 
  AND token = 'AmdIFK+41MXqibep5SL9A6JMrfMUIq6jLKDnfomPyGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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