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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084c25022f62be3fe22f0ae48f56f16022349ff58059d1aed9c3964dbe08d0c5' 
  AND token = '3sOAJpCC1Awxp3uQTOUgbX6Hw4oACnd5H9jcy84+H20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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