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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407a5494f44d1c149749c2f274681e7e0079a140dbe246e15f3753607be5a7cb' 
  AND token = 'TQVndrjjpIJssIx3W3J9SyMOojDALTpkOwBGKFU8TMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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