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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84f06958c29910f4c7ae7918c7c7e2e5c2c4686635853d45766b8248c60459f' 
  AND token = 'NqDrhpGEffNdmeTCBx4vS7ln3/rhk3UiKbsg4v6HTgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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