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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7fcc17045bd2ebe10d0f414f3c69b612dd929cc6ae866b270e6772de36cb8d' 
  AND token = '2INqLFTiVxGYgWcf4LbJOlAoYdDxgD2kPW5JKv2j4sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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