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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff7de9b2c5293659455e8ce5ae530fd7c58c2702327075f3ccd6a50cc70af9f' 
  AND token = 's+vHiCVw9spghQauWSRAjYlctB3Nj06LEgWFRwt4PAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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