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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6085571ac6df0bfab0ab3e1c3caf1d3d8979805eae2ffdffb3a56e60c99e612' 
  AND token = 'aB6Vejc6otz3PjC0QDKDgTASed9MGjONNg27enVoqFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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