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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4540cdb9ab6d6eafcb183d5b83c8c2a8aa4e3d75d8ac60765517f4ce678204' 
  AND token = 'BHLNGIE4IZHrP7L5m7y7jfd1kpB3WB9uIu0n1OYL7Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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