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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ceb4c1e2af74725a32c751d33140ec90c5c3efcf5b9dd336c4e420a76f25bd7' 
  AND token = 'EWwd4epxMk5wkhpyHbk1hed9HNRBokMXskJ0PPZF1R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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