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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c83e76172a042539a776853c26abeab9d73f86e0a6565cfdf4f613a10aeef8' 
  AND token = '49JhRVrnngg5ac0ffU2iT69os42XIGx67936EhQ890c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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