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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3eccaa0ee9fb4d66e4ce83ed4928c55435d1132096c4eaa919b677c14244fc' 
  AND token = 'HDr2o8PjkYVJOFk3A0eCC3mWS1HLMshnmxV9pvYvyCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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