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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbda78cba8cd9bf7ff9cec219e59290afbb8c9942edd48c1af2872f7cea4a64' 
  AND token = 'urLf1HAwmaNfSNq42k8vm72Qv1g1C8kzuEkH6dLq+go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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