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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3967e5e1833ab26330bc69feeed5fe52ea290f62b712ba3bd482ef83b458cc56' 
  AND token = 'f/DBPEPOkkMZC6S8oGMkIo6SW0+wnub3Q1D5nyMXShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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