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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea4dbad0c32c3d277ddc3798fd9c6d8f8a1ba55b996280b491747af442b8c25' 
  AND token = 'glEbuyW5tXKDUAPKVVgMzyCeM++8TvG9PavQv9ZKQiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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