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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767bc81616c63e45da7c0cccbbebf09bdf8706e6bad5135ae5d8a1235deac839' 
  AND token = 'OaXUQrAujTbNDhdOdq7aTo3Xp1MOfkF3we+44UME2Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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