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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a1ac93bd1edb83f2ad2a966c35ea50ee2e408279e40e18a597a1859439acb7' 
  AND token = 'lkHc7iSBVc2lSKrJch86xQ+fWpdBRV+6Ym2vCGVVz9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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