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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994ed846692060c9474593322e9997a47f403f9df63dad046abff794b33e9704' 
  AND token = 'DCmOgIogO/pyLVJy1sfzGBC8hEBdE8L5xsQC/cxgzfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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