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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7ce546fb030a9ffa97652f067c292271e9c66a61cfcdf4a9debbc1e6d02d8b' 
  AND token = 'bgHhtHaOAw/ovWm7g36dc4NZKZhE5dKHHo8NkuH29cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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