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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2965c21e6c1b7779987c2b13973fae0d7e3a3e954f66343b72baf0c9b13e9c' 
  AND token = '85PdUZTUME07FppO66naW5py9KJsxobpidmooeEKZCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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