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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7f41db60ac8e5b8643908973aa46941b8940105406f6f80b385d2a45092d1c' 
  AND token = 'kjGifIkUpsjWRDBGc8j0rt0+lhdJxOy1RfKZkeu7uTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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