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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb56270fe154356fda6460b693f3accc764dc867bb3d76e5994573df9fdd6b72' 
  AND token = 'Ms7Fwn+j+3jrsfzmmhNg6FiOg1+5JBga3sFTyiTYlDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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