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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b12eacd65839830be93498afcb25d55906741c2cabfb418a1b1bfcaaa0b0598' 
  AND token = 'zk12HopGbwCAP32J+EbMDz0tZoE8ByQp9QLAKFKAiAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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