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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c03d40d40818382c7acdb94c7794380f37073f7805b060f8198305b65bfcea3' 
  AND token = 'BiaC1Uxtr4pyGvkBAkQ714WIjg1vLA06/aug39gsuO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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