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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2f4f12e2c2d4b31ad53b883f4c8f98235120c781d7c98954f41c3d364fb8b7' 
  AND token = 'd5lCydAVsqzwVmCS32B7jLcPk0a6gdZtR7o4A72Wj5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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