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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2b4e02e21e0b7eb8a6aa916e82071a8e77a6a1f0a10329c32fca8011b6fb20' 
  AND token = 'uEybGuZ50SQsdMQI82c6yWWvPhygjdLOIjE6pCFItyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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