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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322a9e178c818df0bb308dcff52b185f1eaccd7ae3b3bb50000102a57c6bbdec' 
  AND token = 'beQHurFfM2mVOrkK/FTOH+FJwmNCxRkUVNypiunQPgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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