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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85d3ca5a6553470d967da8d145abd879424c6ca19fdcaf1686869e3ede84647' 
  AND token = 'hpaIMn260DCgLAcaR9mhI+ogR5EMVK2lMNqMEkeYq30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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