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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beaafa062945d443367e2f0a3a20fe7abef2aa921770bfd36faa7bb030a635ad' 
  AND token = '4UaqLfswIb0qfH9y8AsBbelUQsPGhKd/6oPSrmQ/5X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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