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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9356e13154d6c18dc23f18277d2bbecb976dd115ad19578a1b47fa130173e7' 
  AND token = '1wxO1ABrOggYWKJMf/2jK8O5AA5wdE7dTAHUteOhEpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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